“I have a 2 line TG9471B base system. Do I really have to buy a $65 expansion phone or can I get the $25 phones to work with my system? We have a home, a home business, and kids. We have 2 lines coming into the TG9471B. Line 1 is our family number and Line 2 is for our business. We would like to save money and buy 3 more less expensive expansion phones and dedicate them to our family phone number on Line 1, and then just reserve the business phone number to Line 2 and the 2 phone units that came in the box. Can this be done?”